Does anyone have experience using one of these?
My turbo smart actuator has been trouble ever since I had it, big over boost ( have seen 26psi quite often ) and the fitment seems a bit off, not very smooth and the actuator bracket actually allows the body of the actuator to move before it will move the rod and open the wastegate.
Anyway I bought a forge actuator to see if it was better, but I'm not reaching the figures of boost I'd expect.
At stage 4 I expect to get around 21-22 psi overboost and then hold maybe 17-19psi.
The spring in the turbosmart actuator was what they deemed a 10psi spring and the same has come in the forge actuator, yet the forge only produces ~11.5psi max.
I had a purple spring supplied as which forge say is 13psi, when fitted that does provide around ~14.5psi boost.
I seem to have no over boost at all though. It builds to its level and then just holds. Is that a good thing, or not?
The next spring up is 15psi ( yellow ), and forge are happy to supply that. They said some people on the astra VXR even run red spring at around 300bhp.
What I don't quite understand is that the standard actuators are from my understanding are rated about 12psi, and they work fine on stage 4 cars and will hold 19 psi. So how come the forge one wont with a similar spring?
Forge also told me that I shouldn't be winding preload onto the spring because that will limit the control the actuator has. I need to get the right spring for the boost target. At the moment I've preloaded the purple spring a bit, and it will peak and hold around 17psi, which is almost right, however there is zero overboost. That's 17psi peak and then it holds like that.
Is it possible that there is no overboost because the forge actuator is controlling the boost much better than the turbosmart and OEM actuators do? It's my understanding that the overboost is not actually a part of the maps, it's simply that the system cannot control it that well and will normally overshoot its target before setting down at a held level?
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